Merge "document isBinderAlive" into main am: fd474d7a85 am: b90b1c14e8

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/3165057

Change-Id: Ibd334f14ac66e02cf7aa0b37686e0443e91768d2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>